Add makefile and version automation

.gitignore

@@ -0,0 +1 @@
+/output/*

Makefile

@@ -0,0 +1,34 @@
+VERS_MAJOR := 0
+VERS_MINOR := 2
+VERSION := $(VERS_MAJOR).$(VERS_MINOR)
+NEW_MINOR := $$(( $(VERS_MINOR) + 1 ))
+NEW_MAJOR := $$(( $(VERS_MAJOR) + 1 ))
+
+output:
+
+output/sendmail: output
+	go build -o output/sendmail -ldflags "-X main.version=$(VERSION)" ./...
+
+build: output/sendmail
+
+bumpvers-minor:
+	sed -i"" "s/VERS_MINOR := $(VERS_MINOR)/VERS_MINOR := $(NEW_MINOR)/" Makefile
+	git add Makefile
+	git commit -m "Bump version $(VERSION) -> $(VERS_MAJOR).$(NEW_MINOR)"
+	git tag $(VERS_MAJOR).$(NEW_MINOR)
+
+bumpvers-major:
+	sed -i"" "s/VERS_MAJOR := $(VERS_MAJOR)/VERS_MAJOR := $$(( $(VERS_MAJOR) + 1 ))/" Makefile
+	git add Makefile
+	git commit -m "Bump version $(VERSION) -> $(NEW_MAJOR).$(VERS_MINOR)"
+	git tag $(NEW_MAJOR).$(VERS_MINOR)
+
+release-min:
+	make bumpvers-minor
+	make build
+
+release-maj:
+	make bumpvers-major
+	make build
+
+PHONY: bumpvers-minor bumpvers-major release-min release-maj

main.go

@@ -8,7 +8,8 @@ import (
 	"strings"
 )
 
-var version = "0.1"
+var noVersion = "dev"
+var version string
 
 func readFromConsole() string {
 	var text, line string
@@ -90,7 +91,11 @@ func main() {
 	LogInit(dbg)
 
 	if versionFlag {
-		Info.F("Version: %s", version)
+		showVersion := noVersion
+		if version != "" {
+			showVersion = version
+		}
+		Info.F("Version: %s", showVersion)
 		os.Exit(0)
 	}